Curling iron



FIG. 1 is a front elevational view of a curling iron showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right-side elevational view showing the hair curler in the open position; and

FIG. 7 is a top plan view of FIG. 6. 

The ornamental design for a curling iron, as shown and described. 